send_sticker

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already disclose the important profile (readOnlyHint=false, destructiveHint=false, openWorldHint=true, idempotentHint=false), so the description is not required to re-state safety. It nonetheless adds zero behavioral context: nothing about delivery semantics, what happens on an invalid sticker/file reference, rate limits, or how the sticker appears in the chat.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

It is short, but shortness here is under-specification rather than conciseness: a single tautological fragment with no front-loaded constraints or structure for a 15-parameter mutation tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Against 15 parameters, 40% schema coverage, no output schema, and a clearly complex delivery operation, four words of description leave the agent without enough information to invoke the tool correctly beyond the two required fields.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 15 parameters and only 40% schema description coverage, the description must carry meaning, but it explains none — not chat_id vs receiver_user_id, not the sticker file-ID/URL/path forms, not reply_parameters, protect_content, or the direct-messages-only constraint on suggested_post_parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

"Send a sticker." restates the tool name almost verbatim; it names a verb and resource but adds no scope, target, or differentiation from the many sibling send_* tools (send_photo, send_message, send_animation). An agent learns nothing it could not infer from the name alone.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use guidance, no conditions for choosing send_sticker over send_message/send_animation/send_photo, and no mention of prerequisites such as the bot needing access to the target chat. Nothing routes the agent.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.